On Wed, 2017-11-29 at 14:05 +0000, Chris Wilson wrote: > History tells us that if we cannot reset the GPU now, we never will. This > then impacts everything that is run subsequently. On failing the reset, > we mark the driver as wedged, trying to prevent further execution on the > GPU, forcing userspace to fallback to using the CPU to update its > framebuffers and let the user know what happened. > > We also want to go one step further and add a taint to the kernel so that > any subsequent faults can be traced back to this failure. This is > important for igt, where if the GPU/driver fails we want to reboot and > restart testing rather than continue on into oblivion. > > TAINT_DIE is colloquially known as "system on fire", which seems > appropriate for unresponsive hardware. > > v2: Also taint if the recovery fails (again history shows us that is > typically fatal). > > References: https://bugs.freedesktop.org/show_bug.cgi?id=103514 > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx> <SNIP> > @@ -1951,6 +1954,19 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags) > wake_up_bit(&error->flags, I915_RESET_HANDOFF); > return; > > +taint: > + /* > + * History tells us that if we cannot reset the GPU now, we > + * never will. This then impacts everything that is run > + * subsequently. On failing the reset, we mark the driver > + * as wedged, preventing further execution on the GPU. > + * We also want to go one step further and add a taint to the > + * kernel so that any subsequent faults can be traced back to > + * this failure. This is important for igt, where if the > + * GPU/driver fails we want to reboot and restart testing > + * rather than continue on into oblivion. > + */ As Marta mentioned too, How igt works on a given day is bit volatile to document in the kernel comments. With that dropped; Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Regards, Joonas -- Joonas Lahtinen Open Source Technology Center Intel Corporation _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
